[linux] Allow font to use below 1.0f scale

chrome/common/chrome_switches.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "build/build_config.h"
 
@@ skipping 1269 matching lines @@
 #if defined(ENABLE_WAYLAND_SERVER)
 // Enables Wayland display server support.
 const char kEnableWaylandServer[] = "enable-wayland-server";
 #endif
 
 #if defined(OS_WIN) || defined(OS_LINUX)
 extern const char kDisableInputImeAPI[] = "disable-input-ime-api";
 extern const char kEnableInputImeAPI[] = "enable-input-ime-api";
 #endif
 
+#if defined(OS_LINUX)
+// Use X's DPI to determine the device scale factor instead of
+// gtk's font setting.
+const char kEnableXDPIForDSF[] = "enable-xdpi-for-dsf";
+#endif
+
 bool AboutInSettingsEnabled() {
   return SettingsWindowEnabled() &&
          !base::CommandLine::ForCurrentProcess()->HasSwitch(
              ::switches::kDisableAboutInSettings);
 }
 
 bool ExtensionsDisabled(const base::CommandLine& command_line) {
   return command_line.HasSwitch(switches::kDisableExtensions) ||
          command_line.HasSwitch(switches::kDisableExtensionsExcept);
 }
@@ skipping 27 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR VERY NICE FLAGS TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead, please
 // put them in alphabetical order above, or in order inside the appropriate
 // ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches